The best answer for this question is taxpayers of all the nations involved . The major nations that had fought the WWI met in 1921-1922 to discuss the naval race. This meeting limited to a specific ratio the warship and battleship capacity of each nation. The five negotiators countries were USA, France, United Kingdom, Japan, and Italy. As we can see, the major goal was to avoid the increasing battleship construction, that would lead to a new war. In this matter, the groups that would have mostly supported this agreement were the taxpayers of all the nations involved, avoiding all the carnage and destruction one global war would create.